Table 2.

The whole dataset.

No.	X1 = Pressure (MPa)	X2 = Temperature (K)	Y
1	12	308	6.75 × 10−5
2	16	308	1.32 × 10−4
3	20	308	1.77 × 10−4
4	24	308	2.23 × 10−4
5	28	308	2.77 × 10−4
6	32	308	3.41 × 10−4
7	36	308	3.93 × 10−4
8	40	308	4.29 × 10−4
9	12	318	3.46 × 10−5
10	16	318	1.13 × 10−4
11	20	318	1.94 × 10−4
12	24	318	2.70 × 10−4
13	28	318	3.85 × 10−4
14	32	318	5.01 × 10−4
15	36	318	5.67 × 10−4
16	40	318	7.07×10−4
17	12	328	2.20 × 10−5
18	16	328	7.65 × 10−5
19	20	328	2.23 × 10−4
20	24	328	3.09 × 10−4
21	28	328	4.88 × 10−4
22	32	328	6.60 × 10−4
23	36	328	8.16 × 10−4
24	40	328	8.81 × 10−4
25	12	338	1.35 × 10−5
26	16	338	6.33 × 10−5
27	20	338	2.07 × 10−4
28	24	338	3.73 × 10−4
29	28	338	6.07 × 10−4
30	32	338	8.20 × 10−4
31	36	338	9.01 × 10−4
32	40	338	1.28 × 10−3